For Industrial Ethernet, ensuring the security of devices and networks is a very important task. It is necessary to take certain measures to prevent illegal access to its system, causing devices and networks to fail to work properly, and certain malicious messages affect the normal operation of the service. provide.
The security problem of traditional Ethernet has been solved by dividing the virtual network segment by VLAN technology. However, with the development of the Internet, in recent years, the network has often been attacked by network viruses such as worms and hackers. Cases of the entire network have occurred from time to time, and the effective bandwidth of legitimate users and the information security of users are difficult to guarantee.
Therefore, when building Carrier Ethernet, you must consider how to ensure the security of the network. The more common Ethernet security solution is to filter illegal data through ACL (access control list) or filtering database; port mirroring technology can copy the input and output traffic of any port to the designated port output, helping network administrators to monitor network data. Content; Some high-end network devices have powerful application-aware and network-level auto-immunization capabilities that automatically sense and filter insecure data streams to a certain degree.
Traditional Ethernet uses link aggregation and spanning tree protocols for protection. Link aggregation consumes a large amount of line and port resources. It is not suitable for metropolitan area networks. The spanning tree protocol/rapid spanning tree protocol recovers when the link fails. In the second level, it is far greater than the 50ms required by the carrier class. Carrier Ethernet technology can take certain measures to ensure that the service switching time is less than 50ms, such as MPLS or Resilient Packet Ring (RPR).
In order to meet the large-scale application of NGN and 3G networks in the next few years, major domestic operators are constantly renovating the original metropolitan area network or re-establishing a new metropolitan area network, striving to provide sufficient quality assurance and bandwidth for new services. Guaranteed network platform.
Due to the increasing QoS and SLA requirements of new services for data networks, new data bearer networks need to be able to implement new functions such as carrier-grade protection, quality of service assurance, and TDM (Time Division Multiplexing) capability support. In this case, telecommunications Level Ethernet technology emerged as the times require, and has become the development direction of the next generation metropolitan area network.
However, it should also be noted that the current QoS, reliability, etc. proposed by the carrier-grade Ethernet technology cannot fully solve all the problems of Ethernet. In order to truly realize the Ethernet service with telecom characteristics, it is still necessary to standardize and mature the technology. There is still a long way to go before we can work harder.
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